EXTECH MA220 User Guide
User’s Guide
400A AC/DC Clamp Meter
Model MA220
Introduction
Thank you for selecting the Extech MA220 AC/DC Clamp Meter. This meter measures
AC/DC Current, AC/DC Voltage, Resistance, Capacitance, Frequency, Duty Cycle,
Temperature, Diode Test, and Continuity. This professional meter, with proper care, will
provide years of safe reliable service.
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must
refer to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use,
hazardous voltages may be present
Double insulation
SAFETY NOTES
• Do not exceed the maximum allowable input range of any function
• Do not apply voltage to meter when resistance function is selected.
• Set the function switch OFF when the meter is not in use.
• Remove the battery if meter is to be stored for longer than 60 days.
WARNINGS
• Set function switch to the appropriate position before measuring.
• When measuring volts do not switch to current/resistance modes.
• Do not measure current on a circuit whose voltage exceeds 240V.
• When changing ranges using the selector switch always disconnect the test leads
from the circuit under test.
• Do not exceed the maximum rated input limits.
OVERVOLTAGE CATEGORY III
This meter meets the IEC 610-1-95 standard for OVERVOLTAGE CATEGORY III. Cat III
meters are protected against overvoltage transients in fixed installation at the distribution
level. Examples include switches in the fixed installation and some equipment for industrial
use with permanent connection to the fixed installation.
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Meter Description
1. Conductor jaws
2. Jaw opening trigger
3. Function select switch
4. LCD Display
5. ZERO button
6. Data Hold and Backlight Button
7. Mode select button
8. Range select button
9. Hz/%/Duty Cycle button
10. COM input jack
11. V/Ω/Temp jack
12. Battery cover (rear)
AC AC (alternating current)
DC DC (direct currrent)
Minus sign
AUTO AutoRange mode
ZERO mode
ZERO
•)))
Audible Continuity
HOLD Data Hold mode
Diode test mode
m milli
V Volts
A Amps
K kilo
M Mega
Ω Ohms
°F Degrees Fahrenheit
°C Degrees Centigrade
Low Battery icon
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